Is An Increased Trapezial Slope A Cause Of Early Trapeziometacarpal Osteoarthritis?
Mauro Maniglio, MD.1, Lara Maniglio, MD1,2, Fabian Aregger, MD3 and Andreas Schweizer, MD4, (1)Balgrist University Hospital, Zürich, ZH, Switzerland, (2)Hospital Grabs, Grabs, Switzerland, (3)Inselspital, Bern, BE, Switzerland, (4)Department of Orthopedics, Balgrist University Hospital, Zurich, Switzerland
Introduction
The thumb carpometacarpal joint Osteoarthritis is one of the most common Osteoarthritis of the hand. And due to the ageing population, the number of people suffering from it is continually increasing. The underlying causes are multifactorial. It is controversially discussed in literature if an increased trapezial slope poses a biomechanical risk factor for thumb carpometacarpal joint Osteoarthritis.
Material and Methods
We measured the trapezial slope (Fig 1) as well as 1st metacarpal slope ( Fig 2) of 37 patients with early thumb carpometacarpal joint Osteoarthritis and compared it with 41 patients without osteoarthritis using a computer-supported 3D-analysis based on CT scans .
Results
A significant difference in trapezial slope in patients with (111°) and without (107°) osteoarthritis was found. In 1st metacarpal slope we also found a significant difference (17° in patients with Osteoarthritis and 14° in patients without).
Conclusion
According to our results a steeper trapezial slope seems to be a risk factor for thumb carpometacarpal joint Osteoarthritis. Therefore, a correction of the trapezial slope by osteotomy of the trapezium bone could be a valuable surgical approach to early thumb carpometacarpal joint Osteoarthritis.
Our result further confirme a difference in the slope of the 1st metacarpal, what would underline the already common surgical approach to early thumb carpometacarpal joint Osteoarthritis with an oblique osteotomy of the 1st metacarpal.
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